In Yeadon's zoo, even the gift shop offerings would be bioengineered; polymer scaffolds used to grow human organs could be used to grow fingernails for the beauty salon. Geckovators would crawl up the walls, replacing conventional elevators.

I was reading about this, when it struck me that Frank Herbert had written about something that this guy needs in his 1977 novel The Dosadi Experiment - zoo fences:

There were bold stretches of lawn and hidden scraps of lawn, and some stretches of greenery which were not lawn at all but mobile sheets of predatory leaf imprisoned behind thin moats of caustic water.